I can assume that the data is coming from the server and it takes time to finish the request.
Please have in mind that the Grid is not loading data itself and it only renders the data that it is passed to it. This means that the moment the Grid has data is the same time the data is received from the server and set in the state.
A similar implementation can be seen in our demo with server data. The data is loaded when we hit the `then` callback from the fetch requests:
Let me know if you need additional information on this matter.
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